Burner port structure



Sept l0, 1957 w. H. BAILEY, JR 2,805,709

BURNER PORT STRUCTURE Filed May 26, 1954 17.4. BY ,1, 7 5M United StatesPatent() BURNER PORT STRUCTURE William H. Dailey, Jr., Toledo, Ohio,assgnor to Surface Combustion Corporation, Toledo, Ohio, a corporationof Ohio Application May 26, 1954, Serial No. 432,376

6 Claims. (Cl. 158-1) This invention relates to burner apparatus forburning fuel in furnaces such as soaking pit furnaces, and is designedto provide a burner which is adaptable to relative expansion of steelmetal and refractory portions of the furnace without affecting theefficiency thereof and which is much simplified yet most serviceable inits intended operation.

Large furnaces such as soaking pits often have burner ports in sidewalls formed by aligned apertures in adjacent refractory lining andsteel binding or shell portions of the wall. In such furnaces there is aconstant problem of maintaining a continuous refractory lining for theside wall about the refractory aperture, and maintaining the aperturealigned with the steel binding or shell and the burner apparatussupported thereon. When relative expanf sion or other forces opens apath through the refractory lining to the steel binding or shell, andopens a space between the lining and the binding or shell, Acombustiblemixtures pass through the path and burn adjacent the binding or shell,causing overheating of the binding or shell, warpage, and early failureof the wall, especially the steel binding or shell.

This invention provides a furnace lining movable adjacent the steelbinding or shell without strain upon the structure and without openingsuch paths or spaces, and by a pre-arranged misalignment of refractoryburner port lining with the burner when the structure is cold, thestructure is maintained in proper alignment at operating temperatures.Special structure maintains a refractory nozzle portion of the burnerport positioned in the refractory wall and suitably aligned with thesteel binding or shell.

This application is a continuation-in-part of my application Serial No.257,019 tiled Nov. 19, 1951.

For a consideration of what I believe to be novel and my invention,attention is directed to the following portions of this specification,the drawing, and the concluding claims hereof.

In the drawing:

Fig. 1 is a diagrammatic representation of soaking pit furnace apparatusto which the invention is applied.

Fig. 2 is a vertical, longitudinal sectional view of the burnergenerally illustrated in Fig. l.

Fig. 3 is an enlarged view of a portion of the burner of Fig. 2.

Fig. 4 is an enlarged View of an alternate construction for the portionof Fig. 3.

The soaking pit comprises a combined combustion and heating chamberwhich is normally closed by a removable cover 11, the chamber being of asize to contain a plurality of steel ingots 12 indicated in outline bydiscontinuous lines. Heating flame enters the chamber 10 from a firingor burner port 13 whose inlet is coincident with the outlet of a burner14 to which fuel is delivered from a fuel supply box 53 and air forcombustion is delivered by a duct 17. Flue gas is vented from thechamber 10 through an exhaust port 19. The heating unit thus farPatented Sept. 10, 1957 described is a single soaking pit furnace, orhole, and is customarily one of several units in a battery having acommon llue gas exhaust manifold 21 and a common burner air distributingmanifold 22.

Air may be delivered to the air manifold 22 by any conventional means,and may be preheated by a recuperator 24 as herein shown. Air is drawninto the recuperator 24 through entry port 25 and is heated in therecuperator before passing into the plenum chamber 26 of a jet pump 27from which it is inspirated by a jet of air from a compressor 30, pipe31 and jet nozzle 32 and delivered by manifold 22 and pipe 17 to theburner 14.

Flue gases from the chamber 10 pass through the exhaust port 19 to theexhaust manifold 21, through the recuperator 24 wherein some of its heatis transferred to the air drawn therethrough, and thence through exhaustduct 34 to an ejector 35 where a jet of air from the compressor 30, pipe36 and a nozzle 37 inspirates exhaust flue gases from the duct 34 anddelivers them through a venturi stack 38 of the ejector 35.

The burner port is formed in a cast ceramic burner block 41 which issupported on the furnace lining 42 to be substantially integraltherewith and upon relative expansion of the lining with the steelfurnace binding or shell 40, which may be as much as four inches fromcold to operating temperature, the furnace lining and the burner blockmove as a unit with respect to the binding or shell. The burner blockmay be cast in place in the furnace wall. A hanged frame 43 supports theburner block and moves therewith in a plane parallel to the binding orshell. It is retained next adjacent the burner and the steel binding, orshell 40 of the furnace by a retainer track or guide 44 welded thereto.An annular refractory ring 45 is retained in the pit binding forming aconduit between the burner block 41 and the burner 14, the ring beingthicker at the top than at the bottom to allow the burner 14 to beinclined from the horizontal. An extended sleeve portion 46 of thefurnace binding or shell 40 encloses the ring 45 and terminates in aflange 47 to which the burner 14 is secured. This also allows a standardburner assembly to be assembled at any desired angle for a given furnacedesign. As the refractory lining 42 of the furnace expands with relationto the steel binding or shell 40 thereof, the ring 46 and the burner 14remain secured to the steel while the burner block moves with therefractory, the flange frame 43 of the burner block (and consequentlythe monolithic burner block and refractory wall structure) beingretained next adjacent the steel binding or shell by the track 44wherein it moves. The lower portion of the burner block is stepped sothat the brick of the furnace lining therebelow cannot shift to open apath below the monolithic burner block through which the heat of thechamber 10 may see the steel binding or shell, and by radiationover-.heat it, a difficulty inherent in prior designs. A similar stepdesign for the top portion is illustrated in Fig. 4 which also servesanother another function of keying the burner block 41 to the furnacerefractory lining 42 so that the burner block cannot loosen from theflange 43 and fall inwardly toward the chamber 10. Another device forpreventing the burner block from falling away from the binding or shell40 is shown in Fig. 4 and comprises a key member 49 secured to theflanged frame 43 and disposed in a recess in the burner block to holdthe same in position with the frame 43 against the binding or shell 40.Figs. 3 and 4 illustrate the clearance required about the guide 44 inthe refractory 42 which allows the refractory lining to move withrespect to the guide 44 and also allows the frame 43 to move in theguide 44. This design, especially as illustrated in Figs. 2 and 3, iswell adapted to the procedure of casing the burner block in place in therefractory lining.

This burner and furnace design provides a sealed burner port in which`the burner block is properly aligned with burner block through whicliheat and combustiongases mayr pass tol` burn' out the furnace steeld`binding` orshell and thus* cause serious gas'l'eakage and unhalance ofailgas` mixture, which in4 turn affects the eicien'cy of the furnace andthe character of the atmosphere maintained' therein. This invention isaccordingly' wellA suited to its intended purpose.

l. In a furnace, in combination: a metal shell and a refractory liningforming a' wall of the furnace, said shell and lining having alignedapertures in' the'wall; a burner port block disposed in' the aperture ofthe liningl and'inte'- gral with the lining; flange means on the blockand adjacent the shell; guide means secured to* the shell and forming anintegral part thereof confining the flange means to a plane parallel tothe shell while allowing relative movement thereof in' said plane, saidguide means forming a recess in said-plane toaccornmodate said rnove-`ment; and burner means supported on and sealed gas tight to the shellfor delivering fuel and air for combustion to the burner port throughsaid apertures.

2. In a furnace, in combination: a metal shell and a refractory liningforming a wall of the furnace, said shell and lining having alignedapertures inthe wall; a burner port block disposed in Vthe aperture ofthe lining and integral with the lining; iiange means on the block andadjal cent the shell; guide means secured to the shell `and forming anintegral part thereof confining the flange means to a plane parallel tothe shell while allowing relative movement thereof in said4 plane, saidguide means forming a recess in said plane to' accommodate saidmovement; burner means supported on and sealed gas tight to the shellfor delivering fuel and air for combustion to the burner port throughsaid apertures; and a refractory ring having an inclined face disposedin the aperture in the shell between the lining and the burner means,`aligned with the burner block, and forming a conduit from the burnermeans to the burner block.

3. In a furnace, in combination: a metal shell and a refractory liningforming a wall of the furnace, said shell and lining having alignedapertures in the wall; a burner l port block disposed in the aperture ofthe lining and integral with the lining; flange means on the lining; andguide means secured to the shell and forming an integral part thereofconfining `the flange means to a plane parallel withV the shellb Whileallowing relative movement `thereof in said plane, said guide meansforming a recess in said planeto accommodate said movement.

4. ln a furnace, in combination: a metal shell and refractory liningforming a wall of the furnace, said shell and lining having alignedapertures in the wall; a burner` port block disposed castin place in theaperture of the lining and forming part thereof; flange means on thelining and adjacent the shell; guide means secured to the shell andforming an integral part thereof confining the ange means to a planeparallel to the shell whileA allowing relative movement thereof in saidplane, said guide means forming a' recess in saidl plane to accommodatesaid movement; and burner means supported on the shell for deliveringfuel and air for combustion to the burner port through said apertures.

5. In a furnace, in combination: a metal shell and a refractoryliningfo'rrriing a wall' of the furnace, said shell and lining havingalignedi apertures in the wall; a` burner port blockdisposed in the;aperture of the refractory lining and integral withthe lining; flangemeans on' the block adjacent the shell; and guidev meansl secured' tothe shell an'clfforming an integral part thereof andfor'rning a recesswith the lining of said shell confining the ange meansr toa planeparallel to` the shell while'allowing and accommodatingy relativemovement thereof, in keyed relation withv the refractory lining and insaid plane,

6. In afurnace, in combination: a metal shell, and a refractory liningforming a wall of the furnace, said shell and linirighaving-y alignedaperture's'in the wall; a' burner port block disposed inthe aperture ofthe refractory liningandintegral with the lining; flange means on one ofs'aidshelland' burner block; and guide means on the other of said shellandburner block, and in fixed relation thereto confining the llangemeans to a plane parallel with the shell while allowing relativemovement thereof in said planefsaidA guide means forming a recess insaid plane to` accommodate said movement.

References Cited in the file of this patent UNITED STATESk PATENTS1,869,242 Frame i Jfuly 26, 1932 2,561,795 Hess et al. July 24, i

FOREIGN PATENTS 394,789 Germany May 6, 1924

